33128912681 has 8 divisors (see below), whose sum is σ = 33172387584. Its totient is φ = 33085463040.

The previous prime is 33128912659. The next prime is 33128912717. The reversal of 33128912681 is 18621982133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 33128912681 - 2⁶ = 33128912617 is a prime.

It is a super-2 number, since 2×33128912681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33128912651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4536425 + ... + 4543721.

It is an arithmetic number, because the mean of its divisors is an integer number (4146548448).

Almost surely, 2^33128912681 is an apocalyptic number.

It is an amenable number.

33128912681 is a deficient number, since it is larger than the sum of its proper divisors (43474903).

33128912681 is a wasteful number, since it uses less digits than its factorization.

33128912681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12631.

The product of its digits is 124416, while the sum is 44.

The spelling of 33128912681 in words is "thirty-three billion, one hundred twenty-eight million, nine hundred twelve thousand, six hundred eighty-one".